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Gradient Flow Renormalization Schemes for Composite Fermion Operators
Matthew Black, Anna Hasenfratz, Oliver Witzel
We introduce gradient flow (GF) normalization prescriptions for fermionic composite operators in which the flowed fermion wavefunction renormalization factor is fixed nonperturbati…
Heavy-Meson Bag Parameters using Gradient Flow
Matthew Black, Robert V. Harlander, Jonas T. Kohnen +4
We demonstrate the use of the gradient flow combined with the short flow-time expansion (GF+SFTX) as a renormalization procedure for four-quark operator matrix elements and associa…
Bag Parameters for Heavy Meson Lifetimes
Matthew Black, Robert V. Harlander, Jonas T. Kohnen +4
We calculate the dimension-six four-quark matrix elements describing heavy-meson lifetime ratios using the gradient flow with its short flow-time expansion as a renormalizat…
Extracting form factors
Anastasia Boushmelev, Matthew Black, Oliver Witzel
Semileptonic decays are of great phenomenological interest because they allow to determine e.g. CKM matrix elements or test lepton flavor universality. Taking advantage o…